background.py 文件源码

def is_running(name):
    """Test whether task is running under ``name``.

    :param name: name of task
    :type name: ``unicode``
    :returns: ``True`` if task with name ``name`` is running, else ``False``
    :rtype: ``Boolean``

    """
    pidfile = _pid_file(name)
    if not os.path.exists(pidfile):
        return False

    with open(pidfile, 'rb') as file_obj:
        pid = int(file_obj.read().strip())

    if _process_exists(pid):
        return True

    elif os.path.exists(pidfile):
        os.unlink(pidfile)

    return False